#include <stdio.h>
#include <math.h>
main ()
{
    double y;
    int x,m;
    for (y=10;y>=-10;y--){//lekai
    m=2.5*sqrt(100-y*y);
    for (x=1;x<30-m;x++)printf(" ");
    printf("*");
    for (;x<30+m;x++)printf(" ");
    printf("*\n");
    }
}